FOSS solution that's actually really good: https://github.com/jordanbaird/Ice
It's insane to grant that just to move some icons around.
I get why they need the permission to implement their cutesy drag and drop interface.
But I'd like to hear why these apps can't continue to hide menu icons after you've revoked the permission. Ice and Bartender at least require you to grant it at all times last I looked a few months ago.
Maybe I can redeem myself by clarifying that the real frustration here is with bad macOS UX, not people trying to hack around it. I barked up the wrong tree.
To be honest it seems crazy at this point an overflow for menu bar items isn't built into macOS, especially now that all their laptops have this notch that can hide menu bar items if you have too many. Plus it competes with space with the dropdown menu items on the left since if an app has too many they'll wrap to the other side of the notch.